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C. F. MASSEY.

METHOD OF AND APPARATUS FOR REMOVING CONCRETE POLES FROM THEIR MOLDS.

APPLICATION FILED JULY 1|. 19I9.

Patented Sept. 9, 1919.

INVENTOR.

m A TTORNEXST WI TNESS:

UNITED STATES PATENT OFFIGE- CHARLES ii. iv nssnyjor CHICAGO, yinnmois, Assrcaionro MASSEY coNonE'rn PRODUCTS CORPORATION,

GINIA.

OF CHICAGO, ILLINOIS, A CORPORATION OF VIR- METHOD OF AND AIPPARATUS IFOR REMOVING CONCRETE POLES FROMTHEIR MQLDS.

of its primary objects, the provision of'an improved method and apparatus whereby the poles may be removed from their molds, or vice versa, without taking the mold apart, and the cost of production greatly reduced.

In. general, my invention contemplates the provision of an improved method and apparatus whereby I expand the metal mold by the application of steam or some other heating medium, thus permitting Withdrawal of the mold from the pole.

The foregoing, together with such other objects as may hereinafter appear, 1 ob tain by means of an improved method and apparatus which I have illustrated in the accompanying drawings wherein The figure is a partial section and side elevation of the apparatus I employ in carrying out my im proved method, and from which the latter may be readily understood.

The molds used in makingrconcrete poles, either by hand methods or by centrifugal machine methods, are usually of sectional character, that is to say, they are comprised of two half molds each composed of a plurality of half mold sections, such sections being bolted or otherwise secured together to constitute the half molds and the half molds being adapted to be bolted to ether to form the complete mold. I-leretofore, after the completion of a pole, in order to remove the pole from the mold, it was necessary to unbolt the two half molds, which of course necessitates the rebolting together of the two half molds for the casting of another pole. These operations involve considerable labor and time and also require a large amount of floor space, as a result of which the cost of production is quite high. I pro- Speeiiicatioir of Letters Patent.

Patented Sept. 9, 1919.

Application filed July 11, 1919.. .seriei nas onss.

pose to overcome these difliculties by naking it possible to removethe taking the mold apart.

plni carryingoutmy invention, I provide a narrow pit I7 of considerable length and depth, at one upper, edge of which, I pivotally mount a frame 8, in such manner that the end of the frame may be swung downwardly into the pit until the frame assumes substantially vertical position in the pit. Upon the formation of a hole in :its mold, \either by :hand or by machine, 1

I :placeithe mold upon the frame 8 by suitable mechanism such as a crane or a hoist, and clamp the mold in position on the frame by means of suitable clamping devices, such as the strap members 9. The mold is placed in position on the frame with the tip end toward the pivot and the butt end adjacent a block 10 carried by the frame.

The frame 8 is shown in mold receiving position in full lines in the figure, and after the mold has been properly positioned and clamped, the free end of the frame is lowered by such means as the Windlass 12, for example. Before lowering, the end closure plate 11 is removed from the mold, leaving the butt end thereof open. When the frame 8 has been lowered to a position when the center line of the mold is perpendicular the bottom of the mold and the butt end of the pole will be immediately over the flattened surface 13.

WVith the mold in the dotted line position, steam is admitted to the pit 7 through the pipe 15 and the mold is thereby heated and owing to the fact that it gets hot first and to the fact that metal has a higher coeilioient of expansion than concrete, the mold expands sufficiently to free it from the pole which settles on the flat surface 13. The mold with the frame 8 may now be withdrawn from the pole by elevating them by such means as the cable 16 which is hooked to the casting 17 of the frame.

In order to permit of the elevation of the mold and frame, the hinge 18 for the frame 8 is detachably secured to the foundation by meansof bolts 19 or the like, which are taken off previous to elevation.

If desired, after a mold has, been placed pole without is introduced. This arrangement effects a great saving in steam.

I claim:

1. The herein described process whichconsists in forming a concrete pole or the like in a metallic mold, in applying heat to the mold to expand the same, and in Withdrawing the mold.

2. The herein described process which consists in forming a concrete pole or the like ina metallic mold, in applying heat to the mold to expand the same, and in withdrawing the mold from the pole perpendicularly.

3. The herein described process which consists in forming a concrete pole or the like in a metallic mold, in suspending the mold in vertical position, in expanding the mold copies of thispatent. may be obtained for by the application of heat thereto, and in withdrawing the mold from the pole.

4;. The herein described process which consists in forming a concrete pole or the like in a metallic mold, in supporting the ,mold in a chamber in perpendicular position and against movement, in introducin a heating medium into said chamber, an in withdrawingthe mold from the pole vertically.

5. Apparatus for separating a concrete pole or the like and its metallic mold which consists of a suitable frame, adapted to support the mold, a chamber into which said frame maybe moved, and means for heating the mold.

6. Apparatus for separating a concrete pole or the like from its metallic mold Which comprises a pit, a frame adapted to support said mold andto be lowered into said pit, means for heating the mold, and means for withdrawing the mold from the pole.

In testimony whereof, I have hereunto signed my name.

CHARLES F. MASSEY.

five cents each,,by addressing the Commissioner of Patents, Washington, D. G. 

